Difference between Pair and Hashmap?

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What is the necessity to introduce Pair class when Hashmap can do the same job?

I see Pair being introduced to Java version 8

keyvaluepair hashmap collections java
3 Answers

A pair is basically a convenient way of associating a simple key to a value. Maps do the same thing to store key-value pairs but maps stores a collection of pairs and operate them as a whole.

Number of times we have a requirement where a key-value pair shall exist on its own, for instance:

  • A key-value pair needs to be passed to a method as an argument, Or
  • A method needs to return just two values in form of a pair

Map complicates the things when we just need a single pair of key-value.

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